go so far as to; unexpectedly

1. 你太粗心了，居然連你媽媽的生日也忘了。
   It was thoughtless of you to forget your mother's birthday.
2. 你居然建議這樣的事，太可笑了。
   It was absurd of you to suggest such a thing.
3. 他居然有臉要求賠償。
   He had the gall to sue for damages.
4. 他是個懶鬼，他居然悄悄地溜走而把清除工作留給我們來做。
   He's a slacker, he actually skipped off and left us to do the clearing away.
5. 她不但參加了競賽--而且居然獲勝了！
   She not only entered the competition she actually won it!

居的英語翻譯：

然的英語翻譯：